Systemic fungal candida and past antibiotic use typically create issues with stomach acid, which then affects absorption of many nutrients, including zinc. Zinc helps to decrease inflammation in the skin.
You might want to just stick to the sunshine for now. I would guess that there are issues with stomach acid and this can play a role in skin conditions -https://www.candidaplan.com/699/hydrochloric-acid-and-health/
I don't have enough of your history to recommend anything beyond that.